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| Titel |
Diagnostics of active and eruptive prominences through hydrogen and helium lines modelling |
| VerfasserIn |
N. Labrosse, J.-C. Vial, P. Gouttebroze |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 10 ; Nr. 26, no. 10 (2008-10-15), S.2961-2965 |
| Datensatznummer |
250016242
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2961-2008.pdf |
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| Zusammenfassung |
| In this study we show how hydrogen and helium lines modelling can be used to
make a diagnostic of active and eruptive prominences. One motivation for this
work is to identify the physical conditions during prominence activation and
eruption. Hydrogen and helium lines are key in probing different parts of the
prominence structure and inferring the plasma parameters. However, the
interpretation of observations, being either spectroscopic or obtained with
imaging, is not straightforward. Their resonance lines are optically thick,
and the prominence plasma is out of local thermodynamic equilibrium due to
the strong incident radiation coming from the solar disk. In view of the
shift of the incident radiation occuring when the prominence plasma flows
radially, it is essential to take into account velocity fields in the
prominence diagnostic. Therefore we need to investigate the effects of the
radial motion of the prominence plasma on hydrogen and helium lines. The
method that we use is the resolution of the radiative transfer problem in the
hydrogen and helium lines out of local thermodynamic equilibrium. We study
the variation of the computed integrated intensities in H and He lines with
the radial velocity of the prominence plasma. We can confirm that there exist
suitable lines which can be used to make a diagnostic of the plasma in active
and eruptive prominences in the presence of velocity fields. |
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